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No.v330,399. Patented Nov. 17, 1885.

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SAW GUMMBR.

No. 330,399. Patented Nov. 17, 1885.

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I FRIEDRICH HERHOLD AND JOHAN E. MILLS, OF CHICAGO, ILLINOIS; SAID MILLS ASSIGNOR TO SAID HERHOLD.

SAW-SUMMER SPECIFICATIGN forming part of Letters Patent No. 330,399, dated November 1'7, 1885.

Application led May 2, 1884. Serial No. 130,181. (No model.)

To all whom, it may concern.-

Beit known that we, FRIEDRICH HERIIOLD and J oiIA'N E. MILLS, residents of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Saw-Gummers, of which we do declare the following to be a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

Figure 1 is a view in vertical longitudinal section parts being shown in elevation. Fig. 2 is a plan View with parts brok-en away and parts shown in section for better illustration. Fig. 3 is a view in vertical transverse section on linezv ofFig. 2. Fig. liis' a detail sectional view through the vertical shaft, showing the cam-sleeve and arm in elevation. Fig. 5 is a detail plan view of the vertical shaft eccentric and the yoke-arm and swinging arm of the saw-turning mechanism. Fig. 6 is a detail View in side elevation of the mechanism for turning the saw. Fig. 7 is a detail view`in vertical section on line y y of Fig. 8. Fig. 8 is a detail view in vertical longitudinal sec tion on line z z of Fig. 7. Fig. 9 is a detail plan view of the saw-turning arm` and standard shown in Figs. 7 and 8. Fig. 10 is a detail view in longitudinal section through the end of the pattern-block.

Like letters of reference denote corresponding parts in the various views ofthe drawings.

Our present invention consists in certain details of construction that will be hereinafter fully described, and particularly defined in the claims at the end of the specification.

A designates the main frame of the machine, the cross-bar a of which is furnished with the journal-block a', in which rests the lower end of the upright shaft B, carrying the wormwheel b, that derives motion from the worm c on the main drive-shaft C. The upper portion of the shaft B is journaled in the crossplate a2 of the frame-top A, and upon its end has Xed the eccentric wheel D. Through the curved slot d of this wheel D is bolted the pin d', that enters the long slot e of the plate E. This plate is connected to the main table F by means of the adjusting-rod G that enters a threaded perforation in the flange e of the plate E, and has liXed thereon the collar g, that is held between the depending lugs or stopsf of the table. rThe rear end of the rod Gis provided with a small hand-wheel, g', by which the plate E and table F may be readily adjusted with relation to each other when a slight advance of the saw with respect to the grinding-wheel is to be effected. From the top A of the main frame rises the table-support A2, over the sides of which, as seen in Fig. 3, fit the flanges f of the main table F, that rests thereon, and from the under side of this table `depend the beveled flanges f2, within which are held, in a manner free to move, the-'correspondingly-beveled edges of the plate E. In the top of the table F are formed the threaded perforations f3, either of which will receive the journal-bolt li, by which is held the sawcarrying arm H. A double bracket or standard, I, having perforations in each of its sides, receives the set-screw I', by which the position of the arm H is determined. Vithin the long -slot h in the arm H is carried the headed bolt H', that projects through the cup-shapedbearing block H2, upon which the saw is held by means of the double conical hub H3, the jam-nut H, and set-nut H5. By forming the hub as a double cone it can be reversed to adapt it to the different sizes of saw-center holes, and by changing the position of the bolt H in the slot h saws of different diameters may4 be readily presented to the action of the grinding-wheel. In the front portion of the table Fis formed the slot f4, which receives the bolt f5, that carries the washer j, and serves to secure in proper position above the slot the journal-block f7, that sustains the journal f8 of the forked brace-arm F', the position of which is determined by the set-screw f. The purpose of thus forming the bracearmis to enable it to better sustain the saw on each side of the grinding-wheel, and hence permit the wheel to act with greater certainty and less noise.

By means of the slot f4 and adjusting devices shown, the position of the brace-arm with reference to the grinding-wheel can be varied, slight adjustments of the brace-arm being found desirable to suit different forms of saw-teeth.

As will be readily understood by those IOO IOv

skilled in the art, the position of the sawcarrying armH upon the tableF Will depend upon the shape that is to be given to the interdental spaces of the saw.

The above described mechanism is that which serves to properly sustain the saw and give thereto the necessary reciprocating motion, as will hereinafter more fully appear.

The mechanism by which the'rotation of the saw is effected to bring its interdental spaces successively in front of the grinding-wheel will next be described. On each side of the hub of the main eccentricDfits the forked portion le of what is designated the yoke-bar7 K, that slides within a suitable seat in the part A4 of the main frame, and between the shoulfder k' and end plate, k2, of the yoke-bar ts f retracted position.

the eccentric D. The free end of the yokebar is provided on its upper surface with the ribs` or flanges 7c3 and le, the latter bearing against the rib a* of the top of the mainframe. Between the ribs or flanges k3 and k4 is. held the pattern-block K2, through which passes the threaded bolt h5, provided with a clampnut, and having its lower end within athreaded perforation in the slide-block 7c, the lug 7c" of which is adapted to receive the adj listing-rod K3, journaled in the depending lugs las of the yoke bar. The end portion, 7c, of the patternblock is made cam-shaped, for a purpose to be presently explained, and against this portion bears the friction-roller Z, carried by the free end ofthe swinging arm L, that is pivotally connected to the main frame at Z', and has connected therewith, by the cord Z2, the weight L', that serves to keep the arm normally in It will thus be seen that when the eccentric'D is revolved the yoke-bar K will be reciprocated, and the cam-face of the pattern-block bearing upon the roller Z will swing the arm L, the extent and character of the movement of this arm being dependent upon the shape of the pattern-block. From the end of the swinging arm rises the bracket Z3, to which is bolted the shank in of the standard M,through the dish-shaped upper portion of which (see Fig. 8) extends the adjustingrod M', passing through a threaded perforation in the lower end ofthe bolt m', that enters lthe threaded hub or enlargement n in the slideplate N, the flanges n' of which clasp the inclined sides ot' the standard M in such manner as to permit the free movement of the slideplate without danger of displacement. Over the hub n fits the perforated end of the armrest N', that is held in place on the hub by means of the washer and set-nut. Within the upper side of this arm-rest is formed the seat n' for the turning-arm O, through the longslot o of which projects the set-screw o', by means of which the arm can be held at different positions in its seat. By thus adj usting the turning-arm within its seat its length can be varied to accommodate saws of different diameters, and by mounting the arm-rest upon the hub n it can be readily swung, by the spring o2, into position for use, and can be there held by means of the clamp-lever o3 on the top ofthe slide-plate N. Slight adjustments ofthe turning-arm,such as are required at different times in the cutting of the same saw, can be effected by means of the adj usting-rod M'. The extreme end ofthe turning-arm O is bent upward, as shown at o',

to strike against the teeth of the saw.

To the upright shaft B is keyed the calnsleeve B', that has formed upon its periphery the double-faced cam B2, within the path of which projects the double cam-block P, which is cut away, as shown in Figa, to partly encompass the sleeve B', and is pivotally connected by the pin pto the lever-arm P'. From this construction it will b e seen that as the upright shaft B revolves the lower face of the cam B2, bearing upon the upper face of the cam-block P, depresses the lever P', and upon passing from the cam-block causes it to turn upon its pivot-pin p, and thus throwsits point upward into such position that in the next revolution the upper face of the cam willbear upon the lower face of the cam-block, and will elevate the lever. The lever P' is thus alternately raised and lowered, for a purpose to be presently explained, the extent of its movement f 4wrist-pin orjournal, r', that is held within the journal-bearings R' B2 in such manner as` to permit the casting to be freely turned or rocked laterally by the movement of the lever P'. The bearing R' is pivotally connected to the bracket A5 of theniain frame by the bolt r2, and the upper portion, r3, of the plate of this bearing is provided with the slot r, through which passes the screw or pin r, so that the casting can be set at different angles longitudinally, its position being determined by the set-screws R3 on the standard B4 of the bracket A5. Upon the laterally-extended front end of the casting R are the journal-bearings r for the spindle s of the grinding-wheel S, and upon this spindle is carried the pulley S', against the end of which the grinding-wheel is securely clamped by means of the broad washer s' and nut s2. Motion is imparted to the pulley S' by means of the belt T, that passes over the pulley U on the main driveshaft, the pulley V, journaled in a suitable bracket, V', and the pulley W, journaled in the casting R, as seen in Figs. 1 and 2.

The operation of the machine is as follows: Motion being imparted to the main driveshaft C is communicated therefrom to the grinding-wheel by the drive-belt. At the same time the upright shaft B is caused to revolve. By the revolution of the shaft B the eccentric D is turned, and a reciprocating movement is given thereby to the saw through the medium of the plate E, the table F, the saw-sustaining IOC arm H, and connecting parts. This reciprocating movement serves to present the saw to the'action of the grindingwheel, in order to cut one interdental space and to withdraw it therefrom until the saw is turned a sufficient distance to bring the next space in proper position to be cut. As all saws do not have the same shaped teeth and interdental spaces, the swinging saw-sustaining arm and adjusting mechanism are employed in order to present the saw to the grinding-wheel in proper position for cutting different styles of teeth and spaces. As the eccentric D withdraws the saw from the grinding-wheel, it at the same time causes the yoke-bar K to move backward, which bar in turn, by its patternblock K2, forces the swinging lever L forward and causes the arm O to bear upon a tooth of the saw and turn it a sufficient distance to bring the next space before the grindingwheel. The shape of the pattern-block employed is determined by the character of the teeth and spaces ot' the saw being cut, and the curved slot d of the eccentric D allows the adjustment of plate E on the eccentric, so as to properly time with relation to each other the reciprocating and rotary movement of the saw. The successive elevation and depression of the lever P by the cam B2 on the upright shaft causes the automatic tipping of the grinding-wheel necessary to give the proper bevel to the edges of the teeth and interdental spaces of the saw. e

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

l. In a saw-glimmer, the combinationnvith the upright shaft B, of a single eccentric, D, mounted thereon, the saw-supporting arm in suitable connection with said eccentric, and a saw-turning arm, also in suitable connection with the same eccentric, D, substantially as described.

2. In a saw-gummer, the combination, with the upright shaft B and the single eccentric D thereon, of the plate E, the table F, and the arm H, for supporting the saw, and the yokebar K, the swinging arm L, and an arm for turning the saw, all substantially as described.

3. In a saw-gummer, the combination, with the slotted adjustable table F, ol' the brace-arm F', having a journal adjustably held within the slot of the table, substantially as described.

4. In a saw-gummer, the combination ofthe upright shaft B, the eccentric D, the plate E, mounted on the eccentric, the table F, the arm H, the yoke-bar K, the swinging arm. L, and an arm for turning the saw, substantially as described.

5. In a saw gummer, the combination, with a suitable arm-rest and a screw-rod for adjusting the same, of the saw-turning arm adj ustably mounted in the arm-rest, substantially as described.

6. The combination, with the standard M, of the slide plate N, adjustably mounted thereon, the arm-rest N', pivotally held upon the slide-plate and having a seat, n2, therein, the slotted turning-arm O, adjustably held in the seat of the arm-rest, and a set-screW, 0, substantially as described.

7. The combination, with the upright shaft having the cam B2 thereon, of the lever P', the pivoted cam-block P, the arm for rocking the grinding-disk, and suitable connecting mechanism, substantially as described.

8. The combination, with the main frame, of the adjustable bearings RRz, and the devices for adjusting the same, the wheel-sustaining casting B, the wrist-pin r', extending in the radial direction of the grinding-wheel, the grinding-wheel, the driving-pulleys, and mechanism for oscillating the wheel-sustaining castings, substantially as described.

FRIEDRICH HERHOLD. JOHAN E. MILLS.

Witnesses:

GEORGE P. FISHER, Jr., JAMES H. PIERCE. 

